Difference between Alibaba Cloud ApsaraDB for PolarDB and Alibaba Cloud TSDB

1. Alibaba Cloud ApsaraDB for PolarDB :
It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. ApsaraDB architecture supported 5000 physical machines in a single cluster. It is designed for business-critical database applications that require fast performance, high concurrency, and automatic scaling.

2. Alibaba Cloud TSDB :
It is a distributed time-series database. It is a stable, reliable, and cost-effective online high-performance database service. It provides efficient data reading and writing capabilities, high-compression-ratio storage, and time-series data interpolation and aggregation.

Difference between Alibaba Cloud ApsaraDB for PolarDB and Alibaba Cloud TSDB :

S.NO.	Alibaba Cloud ApsaraDB for PolarDB	Alibaba Cloud TSDB
1.	It was developed by Alibaba in August 2013.	It was developed by Alibaba.
2.	It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle.	It is a stable, reliable, and cost-effective online high-performance time series database service.
3.	In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems.	In Alibaba Cloud TSDB there are hosted server operating systems.
4.	The license of Alibaba Cloud ApsaraDB for PolarDB is commercial.	The license of Alibaba Cloud TSDB is also commercial.
5.	It supports XML format.	It does not support XML format.
6.	It supports the Server-side scripting.	It does not support the Server-side scripting.
7.	There is only one partitioning method – Sharding.	There are no partitioning methods.
8.	It supports SQL query language.	It does not support SQL query language.
9.	It supports replication methods.	It does not support replication methods.
10.	ApsaraDB for PolarDB provides the concept of Referential Integrity. Hence, there are Foreign Keys.	TSDB does not provide the concept of Referential Integrity. Hence, no Foreign Keys.
11.	It supports in-memory capabilities.	It does not support in-memory capabilities.
12.	It does not offer any API for user-defined Map/Reduce methods.	It also does not offer any API for user-defined Map/Reduce methods.
13.	It supports ACID properties.	It does not support ACID properties.
14.	Programming languages supported are Java and Python.	Programming language supported is Java.